Buffy and Willow are back together again, reuniting over some family fun and craft-making. Former “Buffy the Vampire Slayer” stars Sarah Michelle Gellar and Alyson Hannigan, who played BFFs on the hit show, were reunited over the weekend in Santa Monica, California. “So this girl (#AlysonHannigan) and her husband (#AlexisDenisof) know how to throw a party," Gellar wrote on Instagram Sunday, sharing a happy snap of her and Hannigan clad in denim-and-white outfits.